My son occasionally rides in the general area of the Rimrocker start point. He noted that the authorities are pretty thorough on enforcement. Especially mufflers and sound. There is (perhaps was, as I don't notice it anymore when I drive by ) a OVH sound compliance bulletin board at the Montrose USFS field office. I would not want to be the person caught without a USDA approved arrester during fire season.Be mindful on spark arresters in the mufflers your running, make sure yours have them, if you get checked and you don't have them, it could be a long walk. They are forecasting another bad fire year coming up out West and they could be checking for that. I see where your in a red flag burn area.